Commit 62511cea authored by Willem de Bruijn's avatar Willem de Bruijn Committed by Alexei Starovoitov
Browse files

selftests/bpf: Test new __sk_buff field gso_size 



Analogous to the gso_segs selftests introduced in commit d9ff286a
("bpf: allow BPF programs access skb_shared_info->gso_segs field").

Signed-off-by: default avatarWillem de Bruijn <willemb@google.com>
Signed-off-by: default avatarAlexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/bpf/20200303200503.226217-4-willemdebruijn.kernel@gmail.com
parent b0ac4941

tools/testing/selftests/bpf/prog_tests/skb_ctx.c

+1 −0
Original line number Diff line number Diff line
@@ -14,6 +14,7 @@ void test_skb_ctx(void) 
		.wire_len = 100,

		.gso_segs = 8,

		.mark = 9,

		.gso_size = 10,

	};

	struct bpf_prog_test_run_attr tattr = {

		.data_in = &pkt_v4,

tools/testing/selftests/bpf/progs/test_skb_ctx.c

+2 −0
Original line number Diff line number Diff line
@@ -23,6 +23,8 @@ int process(struct __sk_buff *skb) 
		return 1;

	if (skb->gso_segs != 8)

		return 1;

	if (skb->gso_size != 10)

		return 1;



	return 0;

}

tools/testing/selftests/bpf/verifier/ctx_skb.c

+47 −0
Original line number Diff line number Diff line
@@ -1010,6 +1010,53 @@ 
	.result = ACCEPT,

	.prog_type = BPF_PROG_TYPE_SCHED_CLS,

},

{

	"read gso_size from CGROUP_SKB",

	.insns = {

	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,

		    offsetof(struct __sk_buff, gso_size)),

	BPF_MOV64_IMM(BPF_REG_0, 0),

	BPF_EXIT_INSN(),

	},

	.result = ACCEPT,

	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,

},

{

	"read gso_size from CGROUP_SKB",

	.insns = {

	BPF_LDX_MEM(BPF_W, BPF_REG_1, BPF_REG_1,

		    offsetof(struct __sk_buff, gso_size)),

	BPF_MOV64_IMM(BPF_REG_0, 0),

	BPF_EXIT_INSN(),

	},

	.result = ACCEPT,

	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,

},

{

	"write gso_size from CGROUP_SKB",

	.insns = {

	BPF_MOV64_IMM(BPF_REG_0, 0),

	BPF_STX_MEM(BPF_W, BPF_REG_1, BPF_REG_0,

		    offsetof(struct __sk_buff, gso_size)),

	BPF_MOV64_IMM(BPF_REG_0, 0),

	BPF_EXIT_INSN(),

	},

	.result = REJECT,

	.result_unpriv = REJECT,

	.errstr = "invalid bpf_context access off=176 size=4",

	.prog_type = BPF_PROG_TYPE_CGROUP_SKB,

},

{

	"read gso_size from CLS",

	.insns = {

	BPF_LDX_MEM(BPF_W, BPF_REG_0, BPF_REG_1,

		    offsetof(struct __sk_buff, gso_size)),

	BPF_MOV64_IMM(BPF_REG_0, 0),

	BPF_EXIT_INSN(),

	},

	.result = ACCEPT,

	.prog_type = BPF_PROG_TYPE_SCHED_CLS,

},

{

	"check wire_len is not readable by sockets",

	.insns = {

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